whoopsie

/ (ˈwʊpsɪ) /

noun informal

a piece of excrement, esp one left by a pet
an embarrassing mistake

Word Origin for whoopsie

C20: from whoops
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012